There are techniques of Buddhism, such as meditation, that anyone can adopt. And, of course, there are Christian monks and nuns who already use Buddhist methods in order to develop their devotion, compassion, and ability to forgive.
There is a way to be purified, to overcome sorrows and grief, to release suffering, to secure the right path to realize nirvana. This is to be mindful.
If you resort to violent methods because the other side has destroyed your monastery, for example, you then have lost not only your monastery, but also your special Buddhist practices of detachment, love, and compassion.
A priest once quoted to me the Roman saying that a religion is dead when the priests laugh at each other across the altar. I always laugh at the altar, be it Christian, Hindu, or Buddhist, because real religion is the transformation of anxiety into laughter.
At a personal level, as a Buddhist practitioner, I deliberately visualize and think about death in my daily practice. Death is not separated from our lives. Due to my research and thoughts about death, I have some guarantee and some conviction that it will be a positive experience.
I will purify my bodily actions through repeated reflection. I will purify my verbal actions through repeated reflection. I will purify my mental actions through repeated reflection. That's how you should train yourself.
Monks, when ignorance is abandoned, and knowledge arises in the monk, with the ending of ignorance and the arising of knowledge he clings neither to sense-pleasures, nor does he cling to views, nor to precepts and vows, nor to a Self-doctrine. Not clinking, he is not disturbed; not disturbed, he attains individually nibbana.